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Simple and Highly Effective Purification of Metallurgical-Grade Silicon Through Metal-Assisted Chemical Leaching

  • Fengshuo Xi
  • Shaoyuan Li
  • Wenhui MaEmail author
  • Kuixian Wei
  • Jijun Wu
  • Keqiang Xie
  • Yun Lei
  • Zhengjie Chen
  • Jie Yu
  • Xiaohan Wan
  • Bo Qin
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The present study proposed a simple and highly effective method for removal of impurities from large-sized particle metallurgical-grade silicon (MG-Si) powders based on metal-assisted chemical leaching (MACL). The various leaching approaches (MACL, HF + H2O2 leaching, HF leaching, HCl leaching) were investigated for leaching behaviors of the main impurities (Fe, Al, Ca, Ti, Ni, V, Mn, and Cu). The leaching results show that the order of impurities’ removal efficiency, from highest to lowest, is MACL > HF − H2O2 leaching > HF leaching > HCl leaching. After MACL, The numerous micro-scale “channels” introduced by MACL which are beneficial for the removal of impurities, especially for the non-dissolving metal impurities, such as copper, calcium, and aluminum. It should be noted that the small amount of Cu mainly come from residual Cu nanoparticle and can be removed by simple acid washing.

Keywords

Metallurgical-grade silicon Silicon purification Metal-assisted chemical leaching Hydrometallurgy 

Notes

Acknowledgements

Financial support of this work from the National Natural Science Foundation of China (Grant No. 51504117, 61764009), the Program for Innovative Research Team in University of Ministry of Education of China (No. IRT_17R48), Yunnan Youth Fund Project (2016FD037), Talent Development Program of KUST(KKSY201563032), Analysis and Testing Foundation of Kunming University of Science and Technology (2018P20173102002).

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Fengshuo Xi
    • 1
    • 2
  • Shaoyuan Li
    • 1
    • 2
  • Wenhui Ma
    • 1
    • 2
    Email author
  • Kuixian Wei
    • 1
    • 2
  • Jijun Wu
    • 1
    • 2
  • Keqiang Xie
    • 1
    • 2
  • Yun Lei
    • 1
    • 2
  • Zhengjie Chen
    • 1
    • 2
  • Jie Yu
    • 1
    • 2
  • Xiaohan Wan
    • 1
    • 2
  • Bo Qin
    • 1
    • 2
  1. 1.State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization in Yunnan ProvinceKunming University of Science and TechnologyKunmingPeople’s Republic of China
  2. 2.Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan ProvinceKunming University of Science and TechnologyKunmingPeople’s Republic of China

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